so like everyone else I couldn't get the Duotherm to move more than a 1/4". I opened up the bench where the water tank is and I could kind of see the back. So some banging, pulling, jiggling, shaking it wasn't coming off.
I went outside and removed the vent.
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Well the metal at the end of the vent was fastened to the housing with two self taping screws. I removed these but it still would not move. The end was larger than the hole itself.